US1383379A - Grease-cup - Google Patents

Description

J. B. BLAIN. GREASE CUP. APPLICATION mm A| .R 27. |918.

1,383,379. Patenteamw, 1921.

2 SHEETS-SHEET l.

anonima J. B. BLAIN. GREASE CUP.

`APPLICATION FILED mm1, 191s.

Patented July 5, 1921.

2 SHEETS-SHEET 2 PATENT OFFICE.

JOHN BBLAIN, OF ROCHESTER, NEW YORK.

GREASE-CUP.

Specification of Letters Patent.

Patented July 5, 1921.

Application led April 27, 1918. Serial No. 231,219.

fo all whom it may concern:

Be it known that I, .JOHN B; BLAIN, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Grease- Cups, of which the following is a specifica-V tion.

The object of this invention is to construct a grease cup out of which the lubricant can be forced out at a greater pressure than has heretofore been possible. j

With this and other objects in view, this invention comprises a combination and arrangement of parts which will be fully illustrated in the drawings, described in the specification and pointed out in the claim at the end thereof.

In the accompanying drawings:

Figure 1 is atop plan view of the grease cup.

Fig. 2 is a side elevation of the grease cup.

Fig. 3 is a vertical section through the cup, the section being taken .on the line :iX-3x of Fig. 2.

Fig. l is a horizontal section through the cup, the section being taken on the line Fig. 5 is a perspective view of the split ring forming part of the piston.

Fig. 6 is a perspective view of the washer' for expanding the split ring.

Fig. 7 is a vertical `sectional View of a grease gun embodying the principles of the grease cup shown i-n Figs. 1 to 4 inclusive.V

Fig. 8 is a top plan view of the grease gun shown in Fig. 5.

Fig. 9 is a horizontal section through the grease gun taken on the line 7X-7x of Fig. V5.

Fig. 10 is aside elevation of the head of the grease gun.

In the several figures of the drawings, like reference numerals indicate like parts.

In the construction of the grease cups that are in general use at the present time,

vthe-pressure with which the lubricant can be forced out is limited. This is partially due to the fact that the piston and its packing is rotated when the lubricant is forced out of the cylinder end and in doing so, allows the lubricant to leak through between the cylinder wall and the packing.

Another reason for the leaking of the ordinary grease cup is due to the fact that at every` refilling of the cup, the piston and its packing must be taken out of the top of the cylinder before it can be filled, and in replacing the piston the packing must be bent forward over the piston while'inserting it into .thelcylinder with the result that the packing is cut or scraped by the edge of the cylinder as it passes in so that it slightly wears off each time it is inserted therein.

The wear of the packing ring due to this cause as well as to the friction between it and the cylinder wall as it rotates inside of it,- soon i'esults-in the leaking of the piston means of a suitable wrench.- The top or4 head 2 of the cylinder 1 is formed integral with the cylinder and has a horizontal and inverted T slot 4 milled into the top at one side thereof. The overlapping flanges 5 and 6 formed'by the T slot 4 project into an annular groove 7 formed in the adjusting nut 8. This adjusting nut .makes threaded engagement with the threaded piston rod 9 which is adapted to pass therethrough in either direction. A piston 10 is carried on the end of the piston rod 9 on the inside of the cylinder, l and is drawn up or forced down therein as the piston rod is screwed through the nut 8 in either one or the other direction.

In assembling the grease cup the circular flange 12 forming one side of the annular groove 7 of the adjusting nut 8 is slid into the bottom of the T slot 4 to bring the threaded opening of the nut 8 in line with the opening 18 provided in the end 2 of the cylinder 1. The piston rod 9 is then inserted into the bottom of the cylinder 1 until it projects through the opening 13 in the end 2 of the cylinder and makes engagement with the threaded adjusting nut 8. The nut 8 is then rotated by a suitable wrench to screw the piston rod upwardly and draw the piston 10 carried on the end ofthe piston rod 9 into the inside'of the cylinder.

As shown in Figs. 1 to 4 inclusive, one side of the threaded piston rod is partially cut away the full length thereof to form a. fiat .section filled out lto form a flat surface in.

the periphery thereof. The flat sides of both the opening 13 and the piston rod 9 will be' placed adjacent to each other when the p1s-V ton rod is inserted int-o the opening in order to prevent the piston rod 9 from turning when the adjusting nut 3 is rotated to thread vthe piston rod through it while drawing in 1 or forcing out the piston 10 in the cylinder 1.

Inthis manner, the piston 10 during its inwar-d or outward movement is never rotatedv and the piston packingA 14 which is carried on the end of the piston 10 always remains in one positionduring its straight line movementalong the cylinder'wall.

The piston 10 comprises a. washer formed o n the end of the piston rod 9. A stud 17 eX- tends out from the center of this washer and has a conical washer 15 adapted to slide thereon. The conical washer 15 projects intoy a conical split ring 16 in which it is heldl in place by the clamping nut 13 which is threaded on the end of the stud 17. The packing 14 isheld against the under side of the washer on the end of the piston rod 9and against the inner wall of the 'cylinder 1 by means of the split ring 16.

l6o 'by the rotation of the adjustingr nut 8 which When the lubricant is forced downl by the piston 1Y0, the conical washer 15 is forced upwardly into thesplit ring 16 and expands it so that the packing is forced outwardly by it against t-he cylinder wall. The greater the pressure with which the lubricant is forced out from the cup, the greater will be the force with which the packing 'of the piston is forced against the cylinder wall7 and the less chancethe lubricant willhave to leak past it. Y Any wear of the packing is taken up by the clamping nut by screwing .it back on the stud to forcethe conical washer into the split ring. This expands the ring and forces the packing outwardly to compensate for the wear on the outside thereof.

The bottom 3 of the cylinder 1 is provided with an opening which is suitably threaded to receive a coupling by means of which the grease cup' can be attached to a bearing.

. To fill the cup the cylinder 1 with its piston is screwed off from the bottom 3 yand the piston is placed in its innermost position near the closed yhead of the cylinder. The lubricant `can then be inserted into the cylinder which is then ready to bescrewed back onto thebottom. The lubricant is forcedthrough the'opening in this bottom forces the piston rod 9 and its piston 10 "downwardly against the lubricant contained in the cylinde f Y "In Figs. 7 to 10 inclusive, the construc- Y2.1"having a suitable opening 22 provided in 'length of and made room in the cylindertoV v tion of the grease cup heretofore described isembodied in. aso-.called grease gun. The cylinder 2O of this grease gun is threaded at the bottom to receive the threaded bottom the center thereof through which the grease is forced out. The other en-d of the cylinder' 20 has the head 23fastened thereto through which the piston rod 24 is adapted to pass.

Anopening'25 having a fiat side similar to 75 the opening 13 in the cylinder 1 of the grease cup as shownin crosssection in Fig. 7, is provided inthe center of the head 23 through which the piston rod 24 is adapted to pass. 'j Y f The pistonk rod 24 is Vsuitably threaded along the full length thereof, and has one side thereof -cut away to form a flat surface thereon which' corresponds with the flat side in the opening 25 so that Vwhen the'piston passes through the opening 25,'it is prevented from rotating therein. V A Threaded onlthe piston rod 24 and resting in the pocket 26 provided on'the outer end of the head 23 is the worm wheel 27. This worm wheel is held in place in the pocket' 26 by means of the horizontal flange 28 which! is semi-circular Vin outline and 'overlaps aportion of the-hub 29 of the worm wheel 27. The semi-circular flange 28 forms 95 a part of the top of the `casing 30 which is mounted to swing on a verticalpin 31'carried inthe lug 32.y This lug is integral with the head 23 and projects out `therefromr on Y one side thereof. f v v 100 Mounted torotatein the casing 30 is'the worm 33 which is adaptedV tomesh with'the worin wheel 27 The worm wheel 27 is rotated by this worm which for this purpose has a hand wheel 34 keyed to the outer end of the shaft 35 on whichthe Yworm 33 is carried. On the rotation of the hand wheel 34 theworm 33 rotates the worm wheel 27 and screws the piston rod 24 up orn'down according to the direction' in whichthe hand- 110 wheel is rotated. Y A

The casing 30 is hingedon one side of the head 32 as above described and can be swung away fromthe worm wheel v27 so'asto disengage the worm 33 from the wormY wheel 115 and allow the piston rod 24 to lift the worm wheel out of the pocket 26 to move the piston 36fcarried on the end of the piston rodV 24 on thevinside ofthe cylinder inwardly.

This is donefor'the purpose'ofjquickly 120V filling the gun with a lubricant lso'asl to make unnecessary to revolve the hand wheel 34 until the piston has traversed the whole receive the lubricant.

The worm wheel-27 afterv being liftedl out Y j'of the pocket 26 by the piston during its upward movement and while disengaged from the worm 33 is rotated thereon until it isf brought back in place in the pocket 26; 13o

The cylinder of the gun is then filled and the casing 30 is swung back to allow the worm to again mesh with the worm wheel and hold the worm wheel in place in the pocket through the flange 28 in order that the piston rod and its piston can be forced downwardly by the hand wheel to force the lubricant out of the cylinder. The casing 30 is held locked in place by means of the dog 37 which is pivoted on the side of the head 23. This dog has a hookshaped end 38 which engages with the annular groove 39 provided in the hub of the hand wheel 34, and prevents the casing from swinging horizontally around its pivot pin until it is disengaged therefrom.

I claim.

In a grease cup, the combination of a cylinder, a piston mounted to slide in said cylinder, a packing carried on the under side of said piston, an eXpansible packing ring having a conical opening and being angularly split at one side thereof mounted below said packing, a conical disk adapted to engage into the conical opening in said packing ring, a stem passing through said conical disk and means to prevent the movement of said disk on said stem away from said packing ring7 said disk being adapted to be forced to slide on said stem into the conical opening in said packing ring by the grease contained in said cylinder on the compression thereof by said piston.

In testimony whereof I aiiiX my signature in the presence of two witnesses.

JOHN B. BLAIN.

Witnesses:

H. C. KELLY, ELI EATON.

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